magento-test/app/code/Magento/QuoteGraphQl/etc/graphql/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\QuoteGraphQl\Model\Cart\SetShippingAddressesOnCartInterface"
                type="Magento\QuoteGraphQl\Model\Cart\SetShippingAddressesOnCart"/>
    <preference for="Magento\QuoteGraphQl\Model\Cart\SetShippingMethodsOnCartInterface"
                type="Magento\QuoteGraphQl\Model\Cart\SetShippingMethodsOnCart"/>
    <preference for="Magento\QuoteGraphQl\Model\Cart\MergeCarts\CartQuantityValidatorInterface"
                type="Magento\QuoteGraphQl\Model\Cart\MergeCarts\CartQuantityValidator"/>
    <type name="Magento\QuoteGraphQl\Model\Cart\BuyRequest\BuyRequestBuilder">
        <arguments>
            <argument name="providers" xsi:type="array">
                <item name="quantity" xsi:type="object">Magento\QuoteGraphQl\Model\Cart\BuyRequest\QuantityDataProvider</item>
                <item name="customizable_options" xsi:type="object">Magento\QuoteGraphQl\Model\Cart\BuyRequest\CustomizableOptionsDataProvider</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Quote\Model\Quote\Config">
        <plugin name="append_requested_graphql_attributes" type="Magento\QuoteGraphQl\Plugin\ProductAttributesExtender"/>
    </type>
    <type name="Magento\Framework\GraphQl\Query\ResolverInterface">
        <plugin name="reset-totals" type="Magento\QuoteGraphQl\Plugin\ResetStoredTotalsBeforeTopResolver" sortOrder="1"/>
    </type>
    <type name="Magento\QuoteGraphQl\Model\Cart\TotalsCollector">
        <arguments>
            <argument name="quoteTotalsCollector" xsi:type="object">Magento\Quote\Model\Quote\TotalsCollector\Proxy</argument>
        </arguments>
    </type>
    <virtualType name="Magento\QuoteGraphQl\Helper\Error\PlaceOrderMessageFormatter" type="Magento\GraphQl\Helper\Error\AggregateExceptionMessageFormatter">
        <arguments>
            <argument name="messageFormatters" xsi:type="array">
                <item name="graphql" xsi:type="object">Magento\GraphQl\Helper\Error\MessageFormatters\GraphQlExceptionMessageFormatter</item>
                <item name="no_such_entity" xsi:type="object">Magento\GraphQl\Helper\Error\MessageFormatters\NoSuchEntityExceptionMessageFormatter</item>
                <item name="validation" xsi:type="object">Magento\GraphQl\Helper\Error\MessageFormatters\ValidationExceptionMessageFormatter</item>
                <item name="payment" xsi:type="object">Magento\GraphQl\Helper\Error\MessageFormatters\PaymentExceptionMessageFormatter</item>
                <item name="payment_gateway_command" xsi:type="object">Magento\PaymentGraphQl\Helper\Error\MessageFormatters\GatewayCommandExceptionMessageFormatter</item>
                <item name="payment_gateway_http_client" xsi:type="object">Magento\PaymentGraphQl\Helper\Error\MessageFormatters\GatewayHttpClientExceptionMessageFormatter</item>
                <item name="stock_state" xsi:type="object">Magento\CatalogInventoryGraphQl\Helper\Error\MessageFormatters\StockStateExceptionMessageFormatter</item>
            </argument>
        </arguments>
    </virtualType>
    <type name="Magento\QuoteGraphQl\Model\Resolver\PlaceOrder">
        <arguments>
            <argument name="errorMessageFormatter" xsi:type="object">Magento\QuoteGraphQl\Helper\Error\PlaceOrderMessageFormatter</argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQl\Schema\Type\Enum\DefaultDataMapper">
        <arguments>
            <argument name="map" xsi:type="array">
                <item name="CartItemErrorType" xsi:type="array">
                    <item name="undefined" xsi:type="string">0</item>
                    <item name="item_qty" xsi:type="string">1</item>
                    <item name="item_increment" xsi:type="string">2</item>
                </item>
            </argument>
        </arguments>
    </type>
</config>